/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraSystemViewModel.h
Gets a multicast delegate which is called whenever we've received and handled a sequencer time update.
[FOnPostSequencerTimeChange](API\Plugins\NiagaraEditor\ViewModels\FNiagaraSystemViewModel\FOnPostSequencer-) & OnPostSequencerTimeChanged()